[MattK]

I am using ufra 34 shore all round from Kamtec as they come double width so one pair for £16 which does all four wheels fully. Alot of others are running contact donuts in shore between 40 and 35 which come as single pairs and leave a small gap from the edges of the rear wheels. I personally looked for the softest I could get.
I can't say there is any issue with ny foams, but the top drivers may be able to give better guidance on the subject.
I think once u start adding additive the shore rating is not as crucial. The wear rate seems fine anyway.
I think one thing to realise is as Andy has experienced swapping to foams takes a couple of weeks to get use too and allow them to bed in to but the pain is worth it.
I am getting to the point of needing some more additive and have no idea what to go for.
I have now managed the 15 laps so 16 is my next target but think it may take a while!